Differential gearing.



UNITED srA'pngs EMMET P. GRAY, or oiNoINNA'r-r;

r ENT OFFICE.

orno: AssieNon To sear MANU- P ORATION OF MICHIGAN.

DIFFERENTIAL GEARING.

Specification of Letters Patent.

Patented July 31,1906.

Application tiled April 18, 1904. Serial 'No. 203.730,

To (all whom it may concern.-

Be it known that I, EMMET P. GRAY, a citizen of the United States, residing at Cinein nati, in the county of Hamilton and State of Ohio, have invented certain new and useful 1m rovements in Diiierential Gearing, of wlnch the following is a full, clear, and exact description, reference being had to the acof the classreferred to which shall be exceedingly sim ile in construction, strong and durable, an thoroughly eiiicient in action.

The novelty of my invention will be hereinafter more fully set forth, and specifically pointed out in the claims.

In the accompanying drawings, Figure 1 is a sectional plan view of the assembled gear- .ing and parts of the axle. taken on the dotted line 00. 9c of Fig. 8. Fig. 2 is a sectional end elevation on the dotted line *g/ l/ of Fig. 3 with the sprocket in place. Fig. 3 is a side clcvation of the com )lctc gearing arranged inonc side of the shel or case. Fig. 4 is an enlarged elevation of a portion of the sprocket.

The same numerals of reference are used to indicate identical parts in all the figures.

As illustrating the simplest form of my im )roved diil'crcntial gearing, reference is ha to the accompanying drawings, in which 1, Figs. 1 and 2, is one end of an axle, and 2 the other adaccnt end, the two being in alinement and carrying keyed upon their adjacent ends two spur-gears 3 and 4. These spur-gears have extended hubs on each side t iereo'f, surrounding which, on the exterior sides thereof, are bushings'5 and (i.

Journaled loosely on the bushings 5 and 6, resgmctively, are two half parts 8 and 9 of a drum or casing, between the meeting edges of which at the periphery is clam )ed in any suitable manner a sprocket-w]icel 10. i'have shown two methods of'clam )ingthe sprocketwheel 10, which is but a ske eton ring, which while projecting above the periphery of the drum or easing does not exten to the interior thereof'to interfere with the mechanism contained in said drum or easing.

As a simple and very efficient method of securing the sprocket-Wheel in place i divide the circumference of' the central aperture into six equal portions and then out out the metal between any two of these portions, leave the metal in between the next two, cut-- ting out between the'next two, and so on, which will leave projecting portions 16 and cavities 17, as shown in Fig. 4, in the sprocket, and by similarly cutting the adjacent i aces of the two halves of the drum the sprocket and drum will interlock, doing away withthe necessity of any bolts or pins or any other holding devices, so far as shearing or twisting strains between the sprocket and drum are concerned. Of course the two ortions of the drum and the sprocket will iave to be bolted together in some suitable manner, but all the shearin or twisting strains are borne by the int .lugs 16 with the cavities in which they are contained in the periphery of thc drum, and to more perfectly center and unite the parts the lugs 16 are made somewhat thinner than the main body oi" the sprocket, thus providing shouldcrs which rcst upon raised portions or ilangcs at the inner adjacent edges oi the drum, as seen at 7, .Figs. 1 and 2.

Arranged within the drum or casing in pairs (in this instance three pairs being shown) are spur-pin'ions, each pair overlapping and meshing together and at the same time having a cut-out or blank portion 1 1 to escape one of the spur-gcarsas 4, for instance, in Fig.*2and its mate having a similar cutout or blank portion at its opposite end to escape the other gear 3, as at 12 in Fig. 1. Thus while the two pinions 13 and 14, Fig. 3, of each pair constantly inesh together intermediate of the gears 3 and 4 the one meshes at its outer end with one of the gears fast on the shaft or axle within the drum or casing and the other mcshcs with. the other gear, similarly fast upon the other end of the shaft or axle within the drum or casing, as will be readily understood In this way I produce a very nicely balanced earing uniting the divided ends of the shat, which is differential in its character and permits of independent ,movements of the two parts of the shaftat error-king of the bythe pinion carrying bolts no part of the twlsting or shearing strain put upon the s rocket is borne by said bolt, but is borne a together by the two parts of the drum with which the sprocket is interlocked without the necessity of screws or bolts for that ur 'ose, which under the heavy,strains to Whic the parts are put will have a tendency to come oose and fall out, as will be readily understood. i

As before stated, the object in causing the s rocket to interlock with the two halves of t e drum is to obviate all shearing strains on the bolts 15, in this Way entirely doing away with the necessityof any extra bolts or rivets and always maintaining all of the gearing in proper working alinement, the only function OI the bolts 15 besides affording a bearing for the pinions 13 and 14 being to clam the two halves of the drum and the sproc 'et together endwise in such manner as to maintain the interlocking parts in their pro er positions.

ll hile I have shown a chain-sprocket in the drawings, it is obvious that a bevel-gear or a spur-gear may be substituted to transmit the power Without departing in any way from the spirit of my invention and that Where it is desired to employ a band-brake upon the difierential it may be placed and have its bearing upon either one or both of the halves of the drum, as will be readily understood.

Having thus fully described my invention, I claim 1. In a differential gear, the combination of two alined shafts arranged end to end, two spur-gears disposed side byside and fast re; spectively to the ends ofsaid shafts, a twopart drum or casing surrounding said gears and held from endwise movement by the same, a sprocket-wheel made fast to said 2. In a differential gear, the combination of two alined shafts arranged end to. end, two spurears disposed side by side and fast respective y to the ends of said shafts, a two- -part drum or casin surrounding said gears and held from en wise movement by the same, a sprocket-wheel made fast to said drum or casing by shouldered internal projecting lugs fitting cut-out portionsin the drum with said shoulders resting on the .periphery of the same to form interlocking means to prevent shearing or twistingnsltlrains, intermeshing pinions in pairs wit said drum or casing, one of each pair engaging the spur-gear on one side and the other thespurgear on the opposite side, and clamping-bolts extending through the end walls of said drum or casing to hold the parts together and serve as be arings forthe inte meshing pinions, substantially as described.

EMMET P. GRAY. YVitnesses EDWARD PEoK, A. B. BRAMBLE. 

